Antique kerosene heaters can be purchased online at eBay, as of 2015. Some of the antique heaters listed there are only available through online auction, while others can be purchased immediately from the dealer listing the item.
A Perfection model 525M kerosene heater including instructions is listed on eBay for $95.99 plus $26.05 for economy shipping, as of 2015. The dealer ships this heater only within the continental United States.
An antique Flamme Bleue kerosene/oil stove heater made in Paris is being sold as an untested display piece for $299.99 plus $29.99 standard shipping, as of 2015.
EBay has 107 products listed under the searchable phrase "antique kerosene heater" as of 2015.